copywrite and publishing issues

not sure what forum this should go in but here it goes: I've got a lot of music that I want to protect - until proof is shown, poor man's copyright means nothing to me. I am also doing a lot of guitar tracks for rap artists... I'm actually getting a chance to do 4 tracks for Yo Gotti's new album. How do I protect my band's music, my personal music, and guitar tracks that I do for other people?